Mercurial > hg
annotate rust/hg-core/src/repo.rs @ 47374:bd88b6bfd8da
rhg: Add support for dirstate-v2
Differential Revision: https://phab.mercurial-scm.org/D10804
author | Simon Sapin <simon.sapin@octobus.net> |
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date | Tue, 25 May 2021 09:20:30 +0200 |
parents | c71e8d9e7f2a |
children | ebdef6283798 |
rev | line source |
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1 use crate::config::{Config, ConfigError, ConfigParseError}; |
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2 use crate::errors::{HgError, IoErrorContext, IoResultExt}; |
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3 use crate::requirements; |
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4 use crate::utils::files::get_path_from_bytes; |
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5 use crate::utils::SliceExt; |
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6 use memmap::{Mmap, MmapOptions}; |
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7 use std::collections::HashSet; |
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8 use std::path::{Path, PathBuf}; |
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9 |
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10 /// A repository on disk |
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11 pub struct Repo { |
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12 working_directory: PathBuf, |
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13 dot_hg: PathBuf, |
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14 store: PathBuf, |
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15 requirements: HashSet<String>, |
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16 config: Config, |
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17 } |
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18 |
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19 #[derive(Debug, derive_more::From)] |
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20 pub enum RepoError { |
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21 NotFound { |
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22 at: PathBuf, |
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23 }, |
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24 #[from] |
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25 ConfigParseError(ConfigParseError), |
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26 #[from] |
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27 Other(HgError), |
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28 } |
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29 |
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30 impl From<ConfigError> for RepoError { |
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31 fn from(error: ConfigError) -> Self { |
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32 match error { |
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33 ConfigError::Parse(error) => error.into(), |
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34 ConfigError::Other(error) => error.into(), |
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35 } |
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36 } |
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37 } |
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38 |
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39 /// Filesystem access abstraction for the contents of a given "base" diretory |
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40 #[derive(Clone, Copy)] |
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41 pub struct Vfs<'a> { |
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42 pub(crate) base: &'a Path, |
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43 } |
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44 |
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45 impl Repo { |
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46 /// Find a repository, either at the given path (which must contain a `.hg` |
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47 /// sub-directory) or by searching the current directory and its |
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48 /// ancestors. |
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49 /// |
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50 /// A method with two very different "modes" like this usually a code smell |
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51 /// to make two methods instead, but in this case an `Option` is what rhg |
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52 /// sub-commands get from Clap for the `-R` / `--repository` CLI argument. |
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53 /// Having two methods would just move that `if` to almost all callers. |
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54 pub fn find( |
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55 config: &Config, |
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56 explicit_path: Option<&Path>, |
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57 ) -> Result<Self, RepoError> { |
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58 if let Some(root) = explicit_path { |
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59 if root.join(".hg").is_dir() { |
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60 Self::new_at_path(root.to_owned(), config) |
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61 } else if root.is_file() { |
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62 Err(HgError::unsupported("bundle repository").into()) |
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63 } else { |
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64 Err(RepoError::NotFound { |
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65 at: root.to_owned(), |
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66 }) |
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67 } |
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68 } else { |
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69 let current_directory = crate::utils::current_dir()?; |
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70 // ancestors() is inclusive: it first yields `current_directory` |
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71 // as-is. |
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72 for ancestor in current_directory.ancestors() { |
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73 if ancestor.join(".hg").is_dir() { |
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74 return Self::new_at_path(ancestor.to_owned(), config); |
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75 } |
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76 } |
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77 Err(RepoError::NotFound { |
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78 at: current_directory, |
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79 }) |
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80 } |
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81 } |
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82 |
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83 /// To be called after checking that `.hg` is a sub-directory |
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84 fn new_at_path( |
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85 working_directory: PathBuf, |
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86 config: &Config, |
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87 ) -> Result<Self, RepoError> { |
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88 let dot_hg = working_directory.join(".hg"); |
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89 |
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90 let mut repo_config_files = Vec::new(); |
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91 repo_config_files.push(dot_hg.join("hgrc")); |
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92 repo_config_files.push(dot_hg.join("hgrc-not-shared")); |
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93 |
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94 let hg_vfs = Vfs { base: &dot_hg }; |
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95 let mut reqs = requirements::load_if_exists(hg_vfs)?; |
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96 let relative = |
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97 reqs.contains(requirements::RELATIVE_SHARED_REQUIREMENT); |
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98 let shared = |
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99 reqs.contains(requirements::SHARED_REQUIREMENT) || relative; |
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100 |
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101 // From `mercurial/localrepo.py`: |
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102 // |
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103 // if .hg/requires contains the sharesafe requirement, it means |
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104 // there exists a `.hg/store/requires` too and we should read it |
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105 // NOTE: presence of SHARESAFE_REQUIREMENT imply that store requirement |
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106 // is present. We never write SHARESAFE_REQUIREMENT for a repo if store |
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107 // is not present, refer checkrequirementscompat() for that |
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108 // |
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109 // However, if SHARESAFE_REQUIREMENT is not present, it means that the |
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110 // repository was shared the old way. We check the share source |
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111 // .hg/requires for SHARESAFE_REQUIREMENT to detect whether the |
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112 // current repository needs to be reshared |
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113 let share_safe = reqs.contains(requirements::SHARESAFE_REQUIREMENT); |
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114 |
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115 let store_path; |
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116 if !shared { |
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117 store_path = dot_hg.join("store"); |
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118 } else { |
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119 let bytes = hg_vfs.read("sharedpath")?; |
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120 let mut shared_path = |
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121 get_path_from_bytes(bytes.trim_end_newlines()).to_owned(); |
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122 if relative { |
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123 shared_path = dot_hg.join(shared_path) |
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124 } |
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125 if !shared_path.is_dir() { |
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126 return Err(HgError::corrupted(format!( |
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127 ".hg/sharedpath points to nonexistent directory {}", |
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128 shared_path.display() |
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129 )) |
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130 .into()); |
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131 } |
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132 |
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133 store_path = shared_path.join("store"); |
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134 |
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135 let source_is_share_safe = |
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136 requirements::load(Vfs { base: &shared_path })? |
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137 .contains(requirements::SHARESAFE_REQUIREMENT); |
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138 |
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139 if share_safe && !source_is_share_safe { |
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140 return Err(match config |
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141 .get(b"share", b"safe-mismatch.source-not-safe") |
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142 { |
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143 Some(b"abort") | None => HgError::abort( |
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144 "abort: share source does not support share-safe requirement\n\ |
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145 (see `hg help config.format.use-share-safe` for more information)", |
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146 ), |
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147 _ => HgError::unsupported("share-safe downgrade"), |
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148 } |
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149 .into()); |
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150 } else if source_is_share_safe && !share_safe { |
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151 return Err( |
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152 match config.get(b"share", b"safe-mismatch.source-safe") { |
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153 Some(b"abort") | None => HgError::abort( |
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154 "abort: version mismatch: source uses share-safe \ |
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155 functionality while the current share does not\n\ |
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156 (see `hg help config.format.use-share-safe` for more information)", |
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157 ), |
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158 _ => HgError::unsupported("share-safe upgrade"), |
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159 } |
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160 .into(), |
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161 ); |
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162 } |
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163 |
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164 if share_safe { |
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165 repo_config_files.insert(0, shared_path.join("hgrc")) |
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166 } |
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167 } |
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168 if share_safe { |
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169 reqs.extend(requirements::load(Vfs { base: &store_path })?); |
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170 } |
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171 |
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172 let repo_config = if std::env::var_os("HGRCSKIPREPO").is_none() { |
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173 config.combine_with_repo(&repo_config_files)? |
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174 } else { |
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175 config.clone() |
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176 }; |
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177 |
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178 let repo = Self { |
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179 requirements: reqs, |
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180 working_directory, |
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181 store: store_path, |
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182 dot_hg, |
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183 config: repo_config, |
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184 }; |
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185 |
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186 requirements::check(&repo)?; |
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187 |
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188 Ok(repo) |
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189 } |
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190 |
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191 pub fn working_directory_path(&self) -> &Path { |
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192 &self.working_directory |
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193 } |
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194 |
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195 pub fn requirements(&self) -> &HashSet<String> { |
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196 &self.requirements |
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197 } |
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198 |
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199 pub fn config(&self) -> &Config { |
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200 &self.config |
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201 } |
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202 |
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203 /// For accessing repository files (in `.hg`), except for the store |
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204 /// (`.hg/store`). |
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205 pub fn hg_vfs(&self) -> Vfs<'_> { |
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206 Vfs { base: &self.dot_hg } |
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207 } |
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208 |
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209 /// For accessing repository store files (in `.hg/store`) |
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210 pub fn store_vfs(&self) -> Vfs<'_> { |
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211 Vfs { base: &self.store } |
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212 } |
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213 |
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214 /// For accessing the working copy |
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215 pub fn working_directory_vfs(&self) -> Vfs<'_> { |
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216 Vfs { |
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217 base: &self.working_directory, |
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218 } |
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219 } |
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220 |
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221 pub fn has_dirstate_v2(&self) -> bool { |
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222 self.requirements |
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223 .contains(requirements::DIRSTATE_V2_REQUIREMENT) |
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224 } |
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225 |
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226 pub fn dirstate_parents( |
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227 &self, |
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228 ) -> Result<crate::dirstate::DirstateParents, HgError> { |
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229 let dirstate = self.hg_vfs().mmap_open("dirstate")?; |
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230 if dirstate.is_empty() { |
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231 return Ok(crate::dirstate::DirstateParents::NULL); |
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232 } |
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233 let parents = if self.has_dirstate_v2() { |
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234 crate::dirstate_tree::on_disk::parse_dirstate_parents(&dirstate)? |
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235 } else { |
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236 crate::dirstate::parsers::parse_dirstate_parents(&dirstate)? |
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237 }; |
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238 Ok(parents.clone()) |
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239 } |
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240 } |
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241 |
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242 impl Vfs<'_> { |
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243 pub fn join(&self, relative_path: impl AsRef<Path>) -> PathBuf { |
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244 self.base.join(relative_path) |
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245 } |
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246 |
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247 pub fn read( |
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248 &self, |
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249 relative_path: impl AsRef<Path>, |
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250 ) -> Result<Vec<u8>, HgError> { |
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251 let path = self.join(relative_path); |
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252 std::fs::read(&path).when_reading_file(&path) |
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253 } |
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254 |
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255 pub fn mmap_open( |
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256 &self, |
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257 relative_path: impl AsRef<Path>, |
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258 ) -> Result<Mmap, HgError> { |
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259 let path = self.base.join(relative_path); |
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260 let file = std::fs::File::open(&path).when_reading_file(&path)?; |
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261 // TODO: what are the safety requirements here? |
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262 let mmap = unsafe { MmapOptions::new().map(&file) } |
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263 .when_reading_file(&path)?; |
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264 Ok(mmap) |
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265 } |
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266 |
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267 pub fn rename( |
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268 &self, |
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269 relative_from: impl AsRef<Path>, |
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270 relative_to: impl AsRef<Path>, |
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271 ) -> Result<(), HgError> { |
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272 let from = self.join(relative_from); |
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273 let to = self.join(relative_to); |
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274 std::fs::rename(&from, &to) |
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275 .with_context(|| IoErrorContext::RenamingFile { from, to }) |
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276 } |
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277 } |